The smallest known star in the universe is OGLE-TR-122b. It has a diameter of 8.29 × 103 km. The largest known star in the universe, VY Canis Majoris, is about 1.67 × 105 times larger than OGLE-TR-122b. What is the diameter of VY Canis Majoris?

A.

2.38 × 109 km

B.

1.38 × 109 km

C.

1.38 × 1011 km

D.

7.3 × 107 km

Question 5

There are 3.2×108 virus in a sample vile. How many total number of virus will there be in 5,000 such vile?

A.

16×108

B.

16.0×1012

C.

1.6×1012

D.

1.6×1011

Question 6

= __?__

A.

4 × 107

B.

4 × 1012

C.

4 × 10−1

D.

4 × 101

Question 7

Find the quotient.

360,000,000 ÷ 0.0008

A.

4.5 × 1010

B.

4.5 × 1011

C.

4.5 × 1012

D.

4.5 × 109

Question 8

Size of a Helium atom is 62 pico meter. If 105 Helium atoms are placed in a straight line, how long line will it make? (1 pico meter = 10−12 meter)

A.

6.2 × 10−17 meter

B.

6.2 × 10−7 meter

C.

62 × 10−6 meter

D.

6.2 × 10−6 meter

Question 9

Weight of a Hydrogen atom is 1.66 × 10−27 kg. How many Hydrogen atoms are there in a container that has 8.3 × 10−3 kg of Hydrogen?